railway RRB Group D Mock Test Series 2024-25 General Science Chemistry Classification of Elements and Periodicity in Properties

નીચેનામાંથી કયા તત્વોમાં ત્રણ વેલેન્સ ઇલેક્ટ્રોન છે?

1
Al
2
Ag
3
Au
4
Ca
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